Savory Cheesy Onion Tart

Delight your taste buds with this Savory Cheesy Onion Tart, a perfect combination of caramelized onions, rich Gruyère and Parmesan cheeses, and delicate hints of thyme encased in a flaky, golden crust. This elegant yet approachable dish emphasizes layers of flavor, achieved by slowly caramelizing yellow onions to a sweet, golden perfection and blending them with a creamy, custard-like filling. Ideal for brunch, lunch, or even a light dinner, this tart is baked to a golden brown and can be served warm or at room temperature. With easy-to-follow steps and a prep time of just 20 minutes, this recipe is your perfect introduction to gourmet comfort food.

Nutriscore Rating: 54/100

Prep Time:20 mins

Cook Time:50 mins

Total Time:70 mins

Servings: 6

Ingredients

• 1 piece Pre-made pie crust
• 3 large Yellow onion
• 2 tablespoons Butter
• 1 tablespoon Olive oil
• 1 teaspoon Thyme leaves
• 1 teaspoon Salt
• 0.5 teaspoon Black pepper
• 1.5 cups Gruyère cheese
• 0.5 cups Parmesan cheese
• 2 large Eggs
• 0.5 cups Heavy cream
• 0.25 cups Whole milk
• 1 teaspoon All-purpose flour

Directions

Step 1

Preheat the oven to 375°F (190°C) and prepare a 9-inch tart pan by lightly greasing it.

Step 2

Roll out the pre-made pie crust and fit it into the tart pan, trimming any excess dough. Use a fork to gently prick the bottom of the crust to prevent bubbling.

Step 3

Place the crust in the fridge to chill while you prepare the filling.

Step 4

Slice the onions thinly into even rings.

Step 5

In a large skillet, heat the butter and olive oil over medium heat. Add the onions and cook for about 20-25 minutes, stirring frequently, until they are golden brown and caramelized. Add the thyme, salt, and pepper in the last 5 minutes of cooking. Remove from heat and let the onions cool slightly.

Step 6

In a mixing bowl, whisk together the eggs, heavy cream, milk, and flour until smooth. Stir in the Gruyère and Parmesan cheeses.

Step 7

Spread the caramelized onions evenly over the prepared crust.

Step 8

Pour the egg and cheese mixture over the onions, making sure it spreads evenly.

Step 9

Place the tart on the middle rack of the oven and bake for 25-30 minutes, or until the filling is set and the top is golden brown.

Step 10

Remove the tart from the oven and allow it to cool for 10 minutes before slicing.

Step 11

Serve warm or at room temperature and enjoy!

Nutrition Facts

Serving size	(1268.4g)

Amount per serving	% Daily Value*
Calories	3313.1

Total Fat 237.2g	0%
Saturated Fat 107.5g	0%
Polyunsaturated Fat 5.5g
Cholesterol 827.4mg	0%
Sodium 5363.4mg	0%
Total Carbohydrate 185.4g	0%
Dietary Fiber 13.2g	0%
Total Sugars 25.5g
Protein 108.4g	0%

Vitamin D 160.8IU	0%
Calcium 2701.6mg	0%
Iron 8.5mg	0%
Potassium 1226.6mg	0%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 64.5%

Protein: 13.1%

Carbs: 22.4%